VR Class Dv12
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The Dv12 (Sv12 and Sr12 until 1977Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters".) is the standard Finnish medium-weight diesel-hydraulic road switcher operated by VR. As all the main lines of Finnish railway network have been electrificied, the locomotive is designated mostly to unelectrified, less frequently used side lines.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". Occasionally it may still pull cargo trains on main lines. It has also been put in service as a shunter, replacing older classes Dv15 and Dv16 as they were retired. A total of 192 locomotives were built by Lokomo and Valmet between the years 1963 and 1984.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters".Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". As of 2025, the oldest Dv12 units still in use are 62 years old.
Technical information
The Dv12 is a general purpose locomotive which was designed for both passenger and cargo train use. Its 1000 kW power is somewhat low by current standards, but it is capable of multiple-unit operation with only one train crew and doublets and triplets are common.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". It has a low axle load of 15.6 tonnes, which makes it very well suited for branch lines that allow only smaller axle loads.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". All the axles are interconnected with shafts and universal joints to the Voith L 216 rs hydraulic transmission.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". Because all axles must rotate at the same speed, the individual slipping of axles is impossible. This translates into a very good tractive effort for a 62 tonne locomotive. The main engine is a Finnish-built Tampella SACM MGO V16 BSHR Diesel with two Brown Boveri-VTR 200 M turbochargers.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters".
The Dv12 has two speed ranges, Script error: No such module "convert". for cargo use and Script error: No such module "convert". for passenger use.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". This mechanical gear can only be switched with the locomotive at standstill.
Variants
Sr12
Between 1965 and 1972, 60 slightly heavier variants of the Sv12 were built.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". These were assimilated in the same series when their nomenclature changed to Dv12.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters".
Sv1
Dv12 number 2501 was modified between 1978 and 1980 to run on electricity instead of diesel, becoming class Sv1 number 3201.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". The locomotive was used first in freight traffic, later in passenger trains between Helsinki and Imatra.[1] The Sv1 was used to test three-phase alternating current electrical engines; the results were used when developing class Dr16.[1] The electrical components were delivered by Strömberg,Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". which was also involved in the Dr16 project. The locomotive was painted yellow with black stripes, a colour scheme known from another short-lived prototype, the Dr15.
In 1984, after four years of testing, the Sv1 was refitted with a diesel engine, returning to its original nomenclature and number.Script error: No such module "Footnotes".Script error: No such module "Check for unknown parameters". Number 3201 is nowadays used on an Sr2 class locomotive. Dv12 number 2501 is currently, in 2019, still in use.
Retirement and future development
In 2009, VR abandoned some of the older units of 2700 series Dv12s.[2] The company plans to purchase new diesel locomotives during the 2010s.[3]
References
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Literature
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- Arttu Käyhkö: Deeverin matkassa Kustantaja Laaksonen, Otavan kirjapaino Keuruu 2015 Template:ISBN
External links
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